I'm looking for a science-fiction short story, probably written by either Isaac Asimov or Poul Anderson. (I was binging on short stories collections from these two authors around the same time, years ago, and I'm pretty sure the story I'm looking for came from one of these books.)

I recall from this story that an alien species has met with humanity, but they originated from a very different kind of world. On their planet, life evolved in another direction, and is based on nitrogen and/or arsenic (I think, it might be something else), whereas Earth-like life is based on carbon and oxygen.

To this alien species, these elements are poison, pretty much like arsenic and nitrogen are poison to humans, and this information plays a role in the story : there is an attempted murder on an alien or a suspicion of murder attempt, maybe at a dinner party. Before that, the relationship between the two species seemed relatively okay.

Can you help me find the title of this story ? I'll edit the post if I remember other details.